Mechanical self-stopping device for pictures with an automatic restarter



' Oct 1937. R. BLUM 2,097,22

MECHANICAL SELF STOPPING DEVICE FOR PICTURES WITH AN AUTOMATIC RESTARTER.Filed July 20, 1936 5 g Fig.5

Patented Oct. 26, 1937 v UNITED STATES PATENT OFFICE.

MECHANICAL SELF-STOPPING DEVICE FOR PICTURES WITH AN AUTOMATIC RE-STARTER Raymond Blum, Paris, France Application July 20, 1936, SerialNo. 91,626

' In France July 25, 1935 3 Claims. (01. alt-1&4)

I This invention relates to a film feeding mechaof the points, but theycan be permitted to connisrn for a moving picture machine, characterizedtime their vertical reciprocating movement.

by the fact that the alternating movement of In order to permitcontinuous operation of the the claw-coupling, usually driven by a rigidpart, cam 5, a spring I is introduced between cam 5 is in this caseoperated by actuating means so and the upper-portion 8 of the-claw l.Accord 5 constructed that it is possible to stop or supingly if theupper portion of the claw remains press the inward movement of theclaw-coupling inunovable, the cam 5 can continue to operate into thefilm-holes without at the same time the spring I producing'thenecessarycompensastopping movement of the various parts of the tion.

16 apparatus. On one of the branches or arms e of the claw 10 Themechanism is so constructed that should I is fixed a blade III whichextends downwardly the claw-couplings be driven into the holes by a andis of sumcient length to have its lower end cam blocked for the purposesofthe stoppage, engaged with an idler H, which, when even the drivingcam continues to operate the claws, with blade Ill prevents rotation ofthe claw-couowing to the adaptability of the mechanism to pling aroundthe axle l2. The film may thus be 15 this movement. ireed'from theclaw-coupling by bringing the If the. claw-couplings are fixed to aswingidler ll into position to engage the blade l0. For lever withasimultaneous forward and backward this purpose the idler H is providedwith a movement produced by a cam, the blocking of flange I3 whichserves as a check for blade Hi, this cam for the purposes of thestoppage neverwhich is yieldably held in its normal position thelesspermits of the swing-movement, owing by an elastic retainer H but ispermitted to to spring which acts upon the lever. revolve around axlel5.

Devices constructed in accordance with this For the purpose of thisdrive, the disc I invention permit instant stoppage of the projechas atriangular lever arm l6 upon which acts tion. as the only inertia to besurmounted is the a cam ll keyed as shown at H! on to a shaft veryslight inward movement oi the claw-coul9. Normally the lever It does notcome into plings, which is held up while the other parts contact withcam I], the shaft l9 being at rest remain in movement. In the preferredembodland the disc ll out of position towards the left ment of theinvention the apparatus is composed of Fig. 2, so that the idler H isfree and permits 1 exclusively of rotating parts to the exclusion ofmovement of the claw back and forth. on the 30 sliding parts which areliable to jam. shaft I9 is keyed cam 20 having a notch for The inventionis illustrated in the accompanyreceiving a latch 2| which is drawn inany desired ing drawing, whereinzmanner. This latch projects and entersthe Fig. 1 isairont view showing a stopping device notch of cam 20 whichis fixed as is shaft is.

of the improved construction applied to a pro- When the cam 20 and theshaft are liberated 35 jection apparatus of the Oehmichen type, with thespring 22 which is anchored to the side pin claws mounted on a framewith an alternating 23 of the cam 20, exerts pull upon the latter drive.when freed from the latch 2|, and the shaft 19 Fig. 2 is adiagrammatical view of the mecha rotates and cam ll acts upon lever 16to swing nism shown in Fig. i. the disk l4 about the pivot shaft or axlel5 and 40 Fig. 3 is a vertical section with parts in elevaeffect asudden displacement of disk it to the tion. left. As a consequence, theclaw ceases its back The claw coupling 8 which carries the points andforth movement and the "film is no longer 2 is mounted on a frame 3driven alternately up engaged. Disconnection of cam 26 frees shaft wardsand. downwards by a cam t which rotates l9, which through the main shaft25 operates 45 around an axle or shaft 5. The points i also a blade 25which, in its turn operates ratchet have horizontal movements, forwardlyand rearwheel 21 secured to the shalt by a pin 28. The wardly impartedto them by a cam 5 carried by shaft l9 can now rotate slowly, so asgradually the shaft t, so that during their downward to withdraw cam llfrom contactwith the lever movement, the points which engage in marginalIt and the disc H is withdrawn by elastic re- 50 perforations of thefilm will carry the dim with tainer 24 and the idler is again free.

them, disconnection of the. points from the film During this time thecam 20 also will be turned taking place during the upward movement. Inand gradually tauten spring 22, and as soon order to stop movement ofthe picture, all that as cam 253 has a sumcient distance to bring its isnecessary is to check the forward movement notch into position oppositethe latch, the latch 55 will move into the notch and hold the camstationary, until the latch is again shifted away from the cam.

Needless to state, the examples of application shown in the drawing areonly those of nonlimitative character, the invention permitting ofvariants and modifications according to the type and model of theapparatus upon which the devices are mounted.

I therefore claim:

1. In a motion picture projecting machine, a film f eding mechanismincluding a vertically reciprocating frame, a film-feeding clutch ex-'tending vertically in front of said frame and having its lower endpivoted to the frame and its upper portion projecting above the frameand provided with film engaging claws extending away from the frame, aspring arm extending from the upper end of said clutch over the upperend of the frame, a rotary shaft, a cam carried by said shaft andoperating in the frame for reciprocating-the frame, a second cam carriedby said shaft and engaging the spring arm for rocking the clutch towardsand away from a film during vertical reciprocation of the frame andclutch, a blade carried by said clutch and extending downwardlytherefrom below said frame, an abutment member movable into and out ofposition to engage the lower portion of' said blade and control tiltingof the clutch, and, means for adjusting the abutment member.

2. In a motion picture projecting machine, film aoemao feeding mechanismincluding a vertically reciprocating frame, a film-feeding clutchextending vertically in front of said frame and having its lower endpivoted to the frame to mount the clutch for swinging movement relativeto the frame into and out of feeding engagement with a film, a springarm extending from the upper end of saidclutch over said frame, meansfor reciprocating the frame and acting upon said arm to effect swingingof the clutch during reciprocation of the frame, a blade carried by saidclutch at one side thereof and extending vertically below the clutch anddownwardly beyond the lower end of the frame, and control meansincluding a member movable into and out of position to engage the lowerend portion of said blade and prevent tilting of the clutch intoposition to have feeding engagement with a film.

3. The structure as claim 2 wherein the control means consists of adriven shaft rotatably mounted transversely of the blade in crossingrelation to the lower portion thereof, a disc pivotally mounted forswinging movement about a vertical axis into and out of position toengage the blade and prevent movement of the clutch towards a film, alever arm extending laterally from said disc at the vertical axisthereof, a cam carried by said driven shaft for engaging said lever armand swinging the disc about its axis, and means for controlling rotationof the driven shaft.

RAYMOND BLUM.

